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                  <p><small><a name="verify_file_CRC_MD5_SHA_values"></a>PeaZip
is a free cross-platform archiver &amp; file hashing utility that
provides
an unified
portable GUI for many Open Source technologies like 7-Zip, FreeArc,
PAQ, UPX... free alternative to WinRar, WinZip &amp; </small><small>similar
proprietary software</small><small>.<br>
- Create 7Z, ARC, BZ2, GZ, *PAQ, PEA, QUAD/BALZ, TAR, UPX, WIM, XZ, ZIP
files<br>
- Open and extract ACE, ARJ, CAB, DMG, ISO, LHA,
RAR, UDF, ZIPX files and more,</small><small> over 200 archive types
supported</small><small><br>
Features of PeaZip includes: </small><small> </small><small>archives
opener and extractor, </small><small>batch creation and </small><small>extraction
                  </small><small>of multiple
archives at once</small><small>,
strong encryption with two factor authentication, encrypted password
manager, </small><small>secure deletion, </small><small>find
duplicate files, </small><small>calculate file hash and checksum
values to verify file integrity and detect errors, corruption, and
forgery,
export job definition as script.</small></p>
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            <td colspan="1" rowspan="1" style="vertical-align: top;"> <br>
            <h1 style="text-align: center;"><big><big><big><a
 name="crc_md5_sha_algorithm"></a>File hashing, checksum software,
verify
CRC MD5 SHA values<br>
            </big></big></big></h1>
            <br>
            </td>
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 style="vertical-align: top; background-color: rgb(248, 247, 246);"><br>
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 style="width: 50%; vertical-align: middle; background-color: rgb(255, 255, 255);">
            <div> </div>
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                  <td style="vertical-align: top;">
                  <ul>
                    <li>
                      <p><a
 href="verify-checksum-hash.html#how_to_verify_file_integrity">COMPUTE
HASH, CHECKSUM TO DETECT DATA CORRUPTION AND FORGERY<br>
                      </a></p>
                    </li>
                  </ul>
                  </td>
                  <td style="vertical-align: top; width: 128px;">
                  <h2><img alt="detect file corruption"
 title="Calculate hash checksum values"
 src="file-format/file-manager.png" style="width: 96px; height: 96px;"
 align="right"></h2>
                  </td>
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 style="background-color: rgb(240, 240, 240); width: 960px; text-align: left;"
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            <td
 style="background-color: rgb(255, 255, 255); vertical-align: top;">
            <div style="text-align: left; color: rgb(0, 0, 0);">
            <h2><big><big><big><a name="how_to_verify_file_integrity"></a><a
 href="verify-checksum-hash.html#crc_md5_sha_algorithm">Compute hash,
checksum to
detect data corruption and forgery</a></big></big><br>
            </big></h2>
            </div>
            <br>
            <a name="file_hashing_software"></a>PeaZip
provides primitives to compute multiple hash and checksum algorithms,
and this feature can be used either to <a
 href="duplicates-hash-checksum.html">find
duplicate files</a> (which have identical checksum/hash value), and to
detect
corrupted files which have different checksum / hash value from a known
one.<br>
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="24" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="text-align: right; vertical-align: middle; width: 64px;">
                  <h2><span style="font-weight: bold;"><img
 title="Find corrupted or forged files" alt="detect corrupt files"
 src="file-format/note.png" style="width: 48px; height: 48px;"><br>
                  </span></h2>
                  </td>
                  <td
 style="font-style: italic; vertical-align: middle;">Data corruption
may arise by simple technical issues - transmission
faults, degradation of memory support - which can usually be detected
with ease by quick and computationally light functions (often
integrated at various levels of transmission protocols and memory
technologies), or may arise from forgery, purposely crafted
modifications
of data created by a malicious attacker to exploit weakness of simpler
error detection mechanisms - which requires calculation of more
powerful verification functions like cryptographically strong hash
algorithms.</td>
                </tr>
              </tbody>
            </table>
            <span style="font-weight: bold;"></span><br>
            <h3 style="font-weight: bold;"><big>Compute error detection
algorithms</big></h3>
            <br>
            <span style="font-weight: bold;"><a name="verify_hash_value"></a>Check
files</span> entry
in
"File tools" submenu (context menu) allows to verify multiple hash and
checksum algorithms on multiple files at once, e.g. to
compare a group of file to identify redundant ones, or <span
 style="font-weight: bold;"></span>to <span style="font-weight: bold;">check
files for corruption</span>
when an original
checksum or hash value is
known (or when it can be calculated for reference from a known safe
copy of the data).<br>
Selected algorithms are performed in a single passage so reading the
data from
disk (usually the main performance bottleneck) occurs only one time,
speeding up the disk-bound part of the process.<br>
The algorithms to be performed can be selected in Options &gt;
Settings, in File Tools tab; calculated output value of hashes and
checksums can
be seen as exadecimal (HEX,
either LSB or MSB) or encoded as
Base64.<br>
            <br>
            <a name="compute_checksum_algorithm"></a>15 checksum and
hash algorithms are currently supported:<br>
            <ul>
              <li>
                <h4>checksum functions Adler32, CRC16, CRC24, CRC32,
CRC64</h4>
              </li>
              <li>
                <h4>general-purpose hash functions as
eDonkey/eMule, MD4, MD5</h4>
              </li>
              <li>
                <h4>cryptographically strong hash:</h4>
              </li>
              <ul>
                <li>
                  <h4>Ripemd160</h4>
                </li>
                <li>
                  <h4>SHA-1</h4>
                </li>
                <li>
                  <h3>SHA-2
family (SHA256, SHA512)</h3>
                </li>
                <li>
                  <h3>SHA-3 family (SHA-3 256, SHA-3 512)</h3>
                </li>
                <li>BLAKE2S and BLAKE2B<br>
                </li>
                <li>
                  <h4>AES-based Whirlpool512</h4>
                </li>
              </ul>
            </ul>
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="24" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; text-align: right; width: 64px;">
                  <h2><span style="font-weight: bold;"><img
 title="Chose hash function" alt="free checksum utility"
 src="file-format/quotes.png" style="width: 32px; height: 32px;"></span></h2>
                  </td>
                  <td style="vertical-align: top; font-style: italic;"><span
 style="font-style: italic;"><a name="verify_file_integrity"></a>Hint:
chose faster checksums like CRC32 to
perform a quick comparison (e.g. to detect duplicate
files of test for casual corruption data errors), but it is
recommended to employ a cryptographically
secure hash function (like BLAKE2S or BLAKE2B, SHA-3 algorithms, or the
AES-based Whirlpool512) to detect
malicious
corruption / forgery attacks that might be calculated in order to pass
undetected
to one (or some) of the non-secure algorithms exploiting collision -
algorithm maps different input to same ouput digest.</span> </td>
                  <td style="vertical-align: bottom; width: 64px;">
                  <h3><img title="CRC vs MD5 vs SHA"
 alt="test file integrity with hash value"
 src="file-format/quotes-inverse.png" style="width: 32px; height: 32px;"></h3>
                  </td>
                </tr>
              </tbody>
            </table>
            <a name="calculate_hash_value"></a>Employing multiple
functions
at once, and especially relying on
cryptographically
strong hash functions as Ripemd160, SHA-2, SHA-3 or Whirlpool, can
defeat
attempt
of forging identical-looking files, as it is computationally feasible
to find a collision (different input files mapped to same output
digest) for
simpler
checksum and hash functions, while finding digest value collisions is
currently not computationally feasible for more robust cryptographic
hash functions.<br>
            <br>
This way, even a purposely crafted modification of a file would not
pass unnoticed to most sophisticated error / forgery detection
algorithms, making
possible to identify not only plain data corruption (e.g. communication
or device fault) but also to avoid certain classes of attacks relying
on replacing original content with forged data.<br>
            <span style="font-weight: bold;"><br>
            </span> <br>
            <big style="font-weight: bold;">Byte-to-byte file
comparison</big><br>
            <span style="font-weight: bold;"><br>
            </span><span style="font-weight: bold;">Compare files</span>
entry in
"File tools" submenu performs byte to byte comparison between two
files, a slower process in which all single bytes of one file are
verified and matched with the same offset byte of the other file.<br>
Unlike checksum / hash comparison, this method it is not subject to
collisions
under any
circumstance, and can effectively tell what the different bytes are,
providing not
only a way to verify if two files are identical or different, but also
to find in details what changes were
made between the two versions.<br>
            <br>
            <br>
            <h3><big><span style="font-weight: bold;">Test archive
files for
errors</span><br>
            </big></h3>
            <br>
            <a name="test_archive_integrity"></a>Most archive formats
can be tested for errors using PeaZip file manager utility routines
(Test button), detecting if data is correctly readable and matches file
format specification's standards, either testing archive table of
content and single archive items. <br>
            <h2><img
 title="Test file integrity to identify corrupt or forged data"
 alt="detect data corruption or forgery" src="test-archive.png"
 style="width: 100px; height: 45px;"></h2>
Some archive types (7z, rar, tar, zipx...) improves error detection
storing pre-computed checksum values (usually CRC32) of archived data.<br>
Data errors can be due to random corruption (faulty support, troubles
during download), out of standard archiving processes (bug, obsolete
specifications), or in worst case purposeful alteration of original
content. In some cases corruption or alteration of data can lead to an <a
 href="peazip-password.html">unreadable archive</a> as result.<br>
Testing archives for errors is an useful good practice sufficient for
low risk scenarios, but if there is a reasonable suspicion of the data
being purposely manipulated it is preferable to test the file with a
cryptographically strong hash function (SHA family, Ripemd, Whirlpool)
against
a known value, using aforementioned "Check files" tool.<br>
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="24" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="text-align: right; vertical-align: middle; width: 64px;">
                  <h2><span style="font-weight: bold;"><img
 title="Built-in error detection" alt="free hashing utility"
 src="file-format/information.png" style="width: 48px; height: 48px;"><br>
                  </span></h2>
                  </td>
                  <td
 style="font-style: italic; vertical-align: middle;"><a
 href="pea-archiving-utility.html">PEA file format</a>
provides a wide array of strong hash functions and authenticated
encryption options, saving inside the archive the calculated digest
values - Adler, CRC32, CRC64, MD5, SHA1, Ripemd, SHA2 (SHA256, SHA512)
and SHA3 (SHA-3 256, SHA-3 512), Whirlpool, plus OMAC or HMAC for
authenticated encryption (default EAX AES256 CTR+OMAC).<br>
In this way the data integrity can be thoroughly tested
during extraction, reducing needs of relying on external hashing tools,
for verification both of integrity and autenticity of the content.</td>
                </tr>
              </tbody>
            </table>
Read more about error detection and related topics: definitions of <a
 target="_blank" href="http://en.wikipedia.org/wiki/Data_integrity">data
integrity<img alt="verify file content" title="Data integrity"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="http://en.wikipedia.org/wiki/Checksum">checksum<img
 alt="validate data integrity" title="Verify checksum value"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank" href="http://en.wikipedia.org/wiki/Hash_function">hash<img
 alt="find hash value" title="File hashing" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, <a
 target="_blank"
 href="http://en.wikipedia.org/wiki/Cryptographic_hash_function">cryptographically
secure hash function<img alt="cryptographic hash algorithms"
 title="Non-invertible hash function" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a>, and <a
 href="http://en.wikipedia.org/wiki/Data_deduplication">data
deduplication<img alt="identify duplicates"
 title="Wikipedia data deduplication" src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> on
Wikipedia, <a target="_blank"
 href="http://csrc.nist.gov/publications/fips/fips200-4/fips-200-4.pdf">sha-2-family<img
 alt="fips certified hash" title="SHA familiy algorithms"
 src="free-rar/extractor.png"
 style="border: 0px solid ; width: 12px; height: 10px;"></a> standard.<br>
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                  </small></td>
                  <td style="vertical-align: top;"><small><br>
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            <p><a href="peazip-help-faq.html">FAQ</a>
&gt; File management &gt; Verify file integrity with hashing and
checksum software<br>
            </p>
Topics and search suggestions about how to verify file integrity,
compute checksum and hash values to detect
errors in files, test data corruption or forgery., calculate CRC32,
Adler, MD5, SHA, SHA2,
SHA3, Ripemd algorithms utility:
            <table style="width: 100%; text-align: left;" border="0"
 cellpadding="6" cellspacing="0">
              <tbody>
                <tr>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">
                  <h4>how to calculate file checksum,</h4>
                  <h4>calculate CRC32,</h4>
verify hash value, <br>
                  <h4>compute SHA256 hash,</h4>
file management utilities,<br>
                  <h4>error detection tool,</h4>
cryptographically secure hash,<br>
how to test files for forgery,<br>
integrated error detection, <br>
file hashing utility, </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">compute
file hash value,<br>
                  <h4>compute MD5 hash,</h4>
how to test archive for errors, <br>
check file hash, <br>
detect error in files,<br>
what is checksum function,<br>
check data forgery, <br>
built-in error detection,<br>
free checksum utility,<br>
sha, sha256, sha3 hash functions,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">
                  <h4> how to
verify file integrity,</h4>
SHA hash calculator,<br>
detect file corruption,<br>
calculate hash of files,<br>
file manager utility,<br>
detect file modification,<br>
what is hash function,<br>
how to identify forged files,<br>
integrated integrity verification,<br>
free hashing software,<br>
                  </td>
                  <td
 style="vertical-align: top; width: 25%; font-style: italic;">
                  <h4>calculate SHA3
hash, </h4>
data integrity testing,<br>
how to indentify corrupt files,<br>
test file integrity,<br>
how to compute checksum value,<br>
SHA-3 algorithms family,<br>
detect forged files,<br>
built-in data verification,<br>
cryptographically strong hash,<br>
crc cyclic reduncdancy check<br>
                  </td>
                </tr>
              </tbody>
            </table>
            </td>
          </tr>
        </tbody>
      </table>
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 style="background-color: rgb(255, 255, 255); margin-left: auto; margin-right: auto; width: 960px; text-align: left;"
 border="0" cellpadding="24" cellspacing="0">
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          <tr>
            <td style="vertical-align: top;">Tag Cloud<br>
            <span class="wrd free-rar1" id="calculate-file-hash"> <a
 href="verify-checksum-hash.html">calculate file hash</a></span> <span
 class="wrd free-rar0" id="compute-checksum-value"> <a
 href="verify-checksum-hash.html">compute checksum value</a></span> <span
 class="wrd free-rar4" id="crc-algorithm"> <a
 href="verify-checksum-hash.html">CRC</a></span> <span
 class="wrd free-rar1" id="error-detection"> <a
 href="verify-checksum-hash.html">error detection</a></span> <span
 class="wrd free-rar0" id="find-identical-files"> <a
 href="duplicates-hash-checksum.html">find identical files</a></span> <span
 class="wrd free-rar4" id="hash-function"> <a
 href="verify-checksum-hash.html">hash</a></span> <span
 class="wrd free-rar1" id="md5-algorithm"> <a
 href="verify-checksum-hash.html">MD5</a></span> <span
 class="wrd free-rar0" id="remove-duplicate-files"> <a
 href="duplicates-hash-checksum.html">remove duplicate files</a></span>
            <span class="wrd free-rar4" id="sha-hash-family"> <a
 href="verify-checksum-hash.html">SHA</a></span> <span
 class="wrd free-rar3" id="test-file-integrity"> <a
 href="verify-checksum-hash.html">test file integrity</a></span><br>
            <span class="wrd free-rar0" id="verify-hash-value"> <a
 href="verify-checksum-hash.html">verify hash value</a></span> <span
 class="wrd free-rar2" id="backup-software"> <a
 href="backup-files.html">backup software</a></span> <span
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 href="free-rar-create.html">create RAR files free</a></span> <span
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file deletion tool</a></span> <span class="wrd free-rar3"
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archiver utility</a></span> <span class="wrd free-rar0"
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opener for Windows 64 bit</a></span> <span class="wrd free-rar3"
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rar tar zip files
utility</a></span> <span class="wrd free-rar0"
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inside rar zip archives</a></span> <span class="wrd free-rar1"
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duplicate files</a></span> <span class="wrd free-rar0"
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            <span class="wrd free-rar0" id="unreadable-corrupted-files">
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sharing security</a></span> <span class="wrd free-rar2"
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 href="how-to-open-rar-tar-zip-files.html">browse 7z rar tar zip
archives</a></span> <br>
            <span class="wrd free-rar2" id="open-encrypted-files"> <a
 href="extract-encrypted-files.html">open
encrypted rar zip files</a></span> <span class="wrd free-rar4"
 id="rar-file-format"> <a href="what-is-rar-file.html">RAR file format</a></span>
            <span class="wrd free-rar3" id="arc-file-format"> <a
 href="arc-file-format.html">.ARC</a></span> <span
 class="wrd free-rar2" id="file-hashing-utility"> <a
 href="verify-checksum-hash.html">free file hashing utility</a></span> <span
 class="wrd free-rar1" id="detect-files-corruption"> <a
 href="verify-checksum-hash.html">detect file corruption</a></span> <span
 class="wrd free-rar2" id="free-password-removal-utility"> <a
 href="change-password.html">password removal tool</a></span> <br>
            <span class="wrd free-rar3"
 id="duplicate-files-finder-utility"> <a
 href="duplicates-hash-checksum.html">duplicate files finder</a></span>
            <span class="wrd free-rar2" id="free-zip"> <a
 href="zip-files-utility.html">free ZIP</a></span> <br>
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            <td style="vertical-align: top; width: 25%;"><small> <img
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